van Wyhe, John; Kjærgaard, Peter C. (1 June 2015). "Going the whole orang: Darwin, Wallace and the natural history of orangutans". Studies in History and Philosophy of Science Part C: Studies in History and Philosophy of Biological and Biomedical Sciences (dalam bahasa Inggris). 51: 53–63. doi:10.1016/j.shpsc.2015.02.006. ISSN1369-8486. PMID25861859.
nih.gov
ncbi.nlm.nih.gov
van Wyhe, John; Kjærgaard, Peter C. (1 June 2015). "Going the whole orang: Darwin, Wallace and the natural history of orangutans". Studies in History and Philosophy of Science Part C: Studies in History and Philosophy of Biological and Biomedical Sciences (dalam bahasa Inggris). 51: 53–63. doi:10.1016/j.shpsc.2015.02.006. ISSN1369-8486. PMID25861859.
worldcat.org
van Wyhe, John; Kjærgaard, Peter C. (1 June 2015). "Going the whole orang: Darwin, Wallace and the natural history of orangutans". Studies in History and Philosophy of Science Part C: Studies in History and Philosophy of Biological and Biomedical Sciences (dalam bahasa Inggris). 51: 53–63. doi:10.1016/j.shpsc.2015.02.006. ISSN1369-8486. PMID25861859.